[Patch Part2 v5 02/31] irqdomain: Do irq_find_mapping and set_type for hierarchy irqdomain in case OF
From: Jiang Liu <hidden>
Date: 2014-11-06 14:18:13
Also in:
linux-acpi, linux-pci, lkml
Subsystem:
irq domains (irq number mapping library), irq subsystem, the rest · Maintainers:
Thomas Gleixner, Linus Torvalds
From: Yingjoe Chen <redacted> It is possible to call irq_create_of_mapping to create/translate the same IRQ from DT for multiple times. Perform irq_find_mapping check and set_type for hierarchy irqdomain in irq_create_of_mapping() to avoid duplicate these functionality in all outer most irqdomain. Signed-off-by: Yingjoe Chen <redacted> Signed-off-by: Jiang Liu <redacted> --- kernel/irq/irqdomain.c | 27 ++++++++++++++++++--------- 1 file changed, 18 insertions(+), 9 deletions(-)
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 610891e63844..4811bee1b8a7 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c@@ -478,11 +478,6 @@ unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data) return 0; } - if (irq_domain_is_hierarchy(domain)) { - virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, irq_data); - return virq <= 0 ? 0 : virq; - } - /* If domain has no translation, then we assume interrupt line */ if (domain->ops->xlate == NULL) hwirq = irq_data->args[0];
@@ -492,10 +487,24 @@ unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data) return 0; } - /* Create mapping */ - virq = irq_create_mapping(domain, hwirq); - if (!virq) - return virq; + if (irq_domain_is_hierarchy(domain)) { + /* + * If we've already configured this interrupt, + * don't do it again, or hell will break loose. + */ + virq = irq_find_mapping(domain, hwirq); + if (virq) + return virq; + + virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, irq_data); + if (virq <= 0) + return 0; + } else { + /* Create mapping */ + virq = irq_create_mapping(domain, hwirq); + if (!virq) + return virq; + } /* Set type if specified and different than the current one */ if (type != IRQ_TYPE_NONE &&
--
1.7.10.4